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Properly calculates a status of stage when shown on a list of pipelines
Previously we were calculating a status for all builds, including retried ones. This were affecting a overall stage status when a build were retried.
Fixes https://gitlab.com/gitlab-org/gitlab-ce/issues/18896 https://gitlab.com/gitlab-org/gitlab-ce/issues/18150
master (if you do - rebase it please)